Solve 2cos^2x+5cosx+2=0

Answers

Answer 1

Answer: $2cos^2x+5cosx+2=0\n x\in<-1;1>\n \Delta=b^2-4ac\n \Delta=9\n √(\Delta)=3\n cosx=1\n or\n cosx=-6\n -6\notin<-1;1>\n$

Then using trygonometric table or a graph we read that:
$cosx=1\Leftrightarrow(x)=0$

Period of cosinus function = 2π
So the last answer is $x=0+2k\pi\n$

Related Questions

What is the product? (2x – 1)(x 4)?

Answers

Answer:

$2x^2+7x-4$

Step-by-step explanation:

The distributive says that:

$a \cdot(b+c) = a\cdot b+ a\cdot c$

To find the product of :

$(2x-1)(x+4)$

then;

$2x(x+4)-1(x+4)$

Using distributive property we have;

$2x^2+8x-x-4$

Combine like terms;

$2x^2+7x-4$

Therefore, the product of $(2x-1)(x+4)$ is, $2x^2+7x-4$

The product of (2x - 1)(x + 4) is $2x^2 + 7x - 4$ .

Here, we have,

To find the product (2x - 1)(x + 4), we need to use the distributive property to multiply each term in the first expression (2x - 1) by each term in the second expression (x + 4).

Using the FOIL method (First, Outer, Inner, Last), we multiply the corresponding terms:

$(2x) * (x) = 2x^2$ (First terms)

(2x) * (4) = 8x (Outer terms)

(-1) * (x) = -x (Inner terms)

(-1) * (4) = -4 (Last terms)

Now, we combine the products:

$2x^2 + 8x - x - 4$

Simplifying further:

$2x^2 + 7x - 4$

So, the product of (2x - 1)(x + 4) is $2x^2 + 7x - 4$ .

To learn more on multiplication click:

brainly.com/question/5992872

#SPJ6

complete question:

What is the product? (2x – 1)(x + 4)=?

5x^3+15x^2+10x please help with this I need to see how its worked out not just the answer I no the answer just don't no how to work out the problem

Answers

hi!

5x^3+15x^2+10x = 0

x(5x^2+15x+10) = 0

=> x=0

5x^2+15x+10=0

5(x^2+3x+2)=0

=> (x+1) (x+2) = 0

x= -1 , x= -2

it has three answers, hope im right :)

Which of the following is a zero for the function f(x) = (x − 15)(x + 1)(x − 10)?X=-15
X=-10
X=1
X=15

Answers

we have the function

$f(x)=(x-15)(x+1)(x-10)$

we know that

The zero's of the function are the values of variable x when the value of the function is equal to zero

in the given function the zero's are

$x=15\nx=-1\nx=10$

therefore

the answer is

$x=15$

The answer should be x=15 because once u subtract 15-15 u get 0 and then u substitute 15 in "x" and then. Multiply 0 by everything else n u get 0:))

What type of expense is a toll

Answers

Answer:

The IRS considers them to be part of your employee business expenses, which fall under the category of miscellaneous deductions. Add the cost of tolls, parking, your other car expenses to your other employee business expenses and combine that amount with other miscellaneous expenses.

Step-by-step explanation:

Answer: Well I guess that you add the cost of tolls like the parking, your car expenses and other workers business expenses combine that amount you got with another miscellaneous expenses

What are the four steps for solving a problem? Should any other factors be accounted for when solving a problem? Should any factors be accounted for when explaining how to solve a problem?

Answers

Analysis of the problem - working out what the problem is and setting down any testing that will happen to check that the solution works.

Design the solution - maybe there is more than one way to solve the problem, but the best way needs to be designed

Implementation of the design - produce the design: testing that the solution works should be included here

Evaluation - The solution is now used to solve the problem: Feedback is asked for to check that the solution does meet the original problem and solves it.

Answer:

Step-by-step explanation:

vbcm n,n kj

(83.9x10^12)(2.87x10^-3)/ 3.76x10^2

Answers

(83.9 × 10^12)(2.87 × 10^-³)
   3.76 × 10²
(83,900,000,000,000)(0.00287)
   376
240,793,000,000
   376
640,406,914.9

Other Questions

Can someone answer please? i will give brain-list

Help me with this it’s about axioms

Which polynomials are prime? Check all that apply.15x2 + 10x – 9x + 720x2 – 12x + 30x – 186x3 + 14x2 – 12x – 28 8x3 + 20x2 + 3x + 1211x4 + 4x2 – 6x2 – 16

Write the explicit rule.-21, -51, -81, -111, -141